EP2182629B1 - Motor drive circuit and electric power steering apparatus - Google Patents
Motor drive circuit and electric power steering apparatus Download PDFInfo
- Publication number
- EP2182629B1 EP2182629B1 EP09174847.5A EP09174847A EP2182629B1 EP 2182629 B1 EP2182629 B1 EP 2182629B1 EP 09174847 A EP09174847 A EP 09174847A EP 2182629 B1 EP2182629 B1 EP 2182629B1
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- EP
- European Patent Office
- Prior art keywords
- circuit
- mosfets
- voltage
- drive circuit
- direct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
- B62D5/0484—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures for reaction to failures, e.g. limp home
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
Definitions
- the invention relates to a motor drive circuit that includes an inverter circuit, and an electric power steering apparatus.
- an alternating-current motor is rotated in accordance with a steering operation performed on a steering wheel.
- the alternating-current motor serves as an electric power generator, and, for example, a battery (direct-current power source) of a vehicle is charged with the electric power generated by the alternating-current motor.
- the steering resistance includes the resistance for generating electric power by concerting kinetic energy into electric energy (hereinafter, referred to as "power generation resistance").
- FIG 5 shows a motor drive circuit with which the power generation resistance is excluded from the steering resistance.
- a pair of interrupting MOSFETs connected in series is arranged in a feed line that connects the positive electrode of a direct-current power source to an inverter circuit.
- These interrupting MOSFETs are connected to the feed line in such a manner that parasitic diodes thereof are in the opposite orientations. Therefore, the situation where an electric current flows through both the parasitic diodes is avoided.
- the interrupting MOSFETs are turned on and off by respective drive circuit.
- Each drive circuit is formed by connecting a voltage divider circuit and a drive MOSFET in series in this order in the direction from the source of the interrupting MOSFET toward the negative electrode of the direct-current power source, and connecting the output of the voltage divider circuit to the gate of the interrupting MOSFET.
- a control circuit continuously transmits gate signals to the drive MOSFETs to keep the interrupting MOSFETs on so that conduction between the direct-current power source and the inverter circuit is permitted.
- transmission of gate signals to the drive MOSFETs is stopped so that the interrupting MOSFETs are turned off.
- conduction between the direct-current power source and the inverter circuit is interrupted so that the power generation resistance of the alternating-current motor is excluded from the steering resistance.
- Japanese Patent Application Publication No. 11-146558 describes a technology in which a pair of MOSFETs connected in series is arranged in a power line in such a manner that parasitic diodes thereof are oriented in the opposite directions and conduction through the power line is interrupted by turning off the MOSFETs.
- An aspect of the invention relates to a motor drive circuit that includes: an inverter that is placed between and connected to a positive electrode and a negative electrode of a direct-current power source; a pair of nonuse-time interrupting MOSFETs connected in series and arranged in a feed line that connects the positive electrode of the direct-current power source and the inverter circuit in such a manner that paired parasitic diodes are in the opposite orientations; a pair of main drive circuits which are formed by connecting voltage divider circuits and drive MOSFETs in series in this order in a direction from sources of the nonuse-time interrupting MOSFETs toward the negative electrode of the direct-current power source, and connecting outputs of the voltage divider circuits to gates of the nonuse-time interrupting MOSFETs; a control circuit that transmits gate signals to the pair of drive MOSFETs to keep the pair of nonuse-time interrupting MOSFETs on in a normal situation, and that stops transmission of the gate signals to the pair of drive MOSFETs to turn off
- the compensation drive circuit turns off the compensation switch element.
- the compensation drive circuit turns on the compensation switch element using an output from the direct-current power source connected to the motor drive circuit in reverse.
- the compensation switch element is connected in parallel to the resistance that forms the voltage divider circuit between the source and the gate of the nonuse-time interrupting MOSFET in which the drain is arranged more proximal to the positive electrode of the direct-current power source than the source. If reverse connection of the direct-current power source occurs, the compensation drive circuit turns on the compensation switch using the output from the direct-current power source so that the source and the gate of the nonuse-time interrupting MOSFET are short-circuited. Thus, the nonuse-time interrupting MOSFET is kept off. In this case, a current path that includes the parasitic diodes is not formed.
- the motor drive circuit may further include a booster circuit that boosts a first voltage that is a voltage of the positive electrode with respect to the negative electrode of the direct-current power source to a second voltage, and outputs the second voltage; and a start circuit that connects a second voltage output portion in the booster circuit that outputs the second voltage with the voltage divider circuits in the main drive circuits via start switches.
- the control circuit may turn on the start switches to apply a difference voltage, which corresponds to a difference between the first voltage and the second voltage, between both terminals of each of the voltage divider circuits in order to turn on the nonuse-time interrupting MOSFETs, and turns off the start switches after the nonuse-time interrupting MOSFETs are turned on.
- the control circuit turns on the drive MOSFETs in the main drive circuits and turns on the start switches while the nonuse-time interrupting MOSFETs are off
- the difference pressure which corresponds to the difference between the first voltage and the second voltage
- the difference pressure is applied between the both terminals of each off the voltage divider circuits (between the source and the gate of each of the nonuse-time interrupting MOSFETs), and the nonuse-time interrupting MOSFETs are turned on.
- the start switches are turned off so that the second voltage is no longer output from the booster circuit.
- the gate signals are transmitted to the nonuse-time interrupting MOSFETs by the pair of main drive circuits that are arranged between the sources and the gates of the respective nonuse-time interrupting MOSFETs, and the negative electrode of the direct-current power source. Therefore, the nonuse-time interrupting MOSFETs are kept on until the drive MOSFETs are turned off.
- FIG 1 shows a vehicle 10 that includes an electric power steering apparatus 11.
- the electric power steering apparatus 11 includes an inter-steered wheel shaft 13 that extends in the lateral direction of the vehicle 10, and the inter-steered wheel shaft 13 passes through a cylindrical housing 15 that is fixed to a vehicle body 10H.
- the respective ends of the inter-steered wheel shaft 13 are connected to steered wheels 12 via tie-rods 14.
- the electric power steering apparatus 11 includes an alternating-current motor 19 (more specifically, a three-phase alternating-current motor: hereinafter, referred to as "motor 19") that serves as a drive source.
- a stator 20 of the motor 19 is fixed in the cylindrical housing 15, and the inter-steered wheel shaft 13 passes through a hollow portion of a rotor 21.
- a ball nut 22 that is fixed to the inner face of the rotor 21 is screwed to a ball screw portion 23 that is formed in the outer face of the inter-steered wheel shaft 13. Rotation of the rotor 21 causes linear motion of the ball screw portion 23.
- the motor 19 is provided with a rotational position sensor 25 that detects the rotational position ⁇ 2 of the rotor 21.
- a rack 24 is formed in one end portion of the inter-steered wheel shaft 13, and a pinion 18 formed at the lower end portion of a steering shaft 16 is meshed with the rack 24.
- a steering wheel 17 is fitted to the upper end portion of the steering shaft 16, and a torque sensor 27 and a steering angle sensor 26 are fitted to a middle portion of the steering shaft 16.
- a vehicle speed sensor 28 that detects the vehicle speed V based on the rotational speed of the steered wheel 12.
- the motor 19 is driven by a motor drive circuit 40 shown in FIG. 2 .
- An inverter circuit 41 in the motor drive circuit 40 is a three-phase bridge circuit that includes a U-phase circuit, a V-phase circuit, and a W-phase circuit (not shown) that are formed between the positive electrode and the negative electrode of a battery 92.
- the inverter circuit 41 converts a direct-current output from the battery 92 into a three-phase alternating current, and supplies the three-phase alternating current to the motor 19.
- an interrupting circuit 42 that is formed by connecting a pair of interrupting MOSFETs 43 and 44 in series is provided.
- the interrupting MOSFETs 43 and 44 are N-channel MOSFETs, and include parasitic diodes 43D and 44D, respectively.
- the sources of the interrupting MOSFETs 43 and 44 are connected to each other so that the parasitic diodes 43D and 44D are in the opposite orientations.
- the cathode of the parasitic diode 43D of the first interrupting MOSFET 43 is arranged on the positive electrode side of the battery 92, and the cathode of the parasitic diode 44D of the second interrupting MOSFET 44 is arranged on the inverter circuit 41-side. Because the parasitic diodes 43D and 44D are in the opposite orientations, a current path that includes both the parasitic diodes 43D and 44D is not formed.
- a fuse 45 is provided in the first feed line L1 at a position between the positive electrode of the battery 92 and the first interrupting MOSFET 43.
- overvoltage protection circuits 46 each of which is formed by connecting the anodes of a pair of zener diodes 46Z to each other, are provided between the gates and the sources of the respective interrupting MOSFET 43 and 44.
- the interrupting MOSFETs 43 and 44 are turned on and off by a pre-driver circuit 50 that is included in the motor drive circuit 40.
- the pre-driver circuit 50 includes, for example, a charge-pump booster circuit 51.
- the booster circuit 51 is connected to a second feed line L2 that branches off from the first feed line L1 at a position between the positive electrode of the battery 92 and the fuse 45.
- an ignition switch 94 provided in the second feed line L2 is turned on, conduction between the booster circuit 51 and the battery 92 is permitted.
- a charge and discharge of a plurality of capacitors (not shown) provided in the booster circuit 51 are repeated, whereby the first voltage V1 (e.g.
- a fuse 93 is provided in the second feed line L2 at a position between the ignition switch 94 and the positive electrode of the battery 92.
- a backflow prevention diode 95 where the cathode is arranged on the booster circuit 51-side is connected to the second feed line L2 at a position between the ignition switch 94 and the booster circuit 51.
- the booster circuit 51 is not limited to a charge-pump booster circuit, and may be formed with the use of a booster coil.
- a feed line L3 connects the second feed line L2 at a portion on the cathode side of the diode 95 to the first feed line L1 at a portion on the drain side of the second interrupting MOSFET 44.
- the feed line L3 is provided to stably supply electric power to the pre-driver circuit 50 and a control circuit 48, for example, even if the electric power fluctuation occur in the second feed line L2 or electric power supply is interrupted due to contact failure of a connector. That is, the pre-driver circuit 51 and the control circuit 48 may receive the electric power from the battery 92 through two power lines.
- a backflow prevention diode 97 where the cathode is arranged on the booster circuit 51-side is provided in the feed line L3. Therefore, an electric current does not flow from the battery 92 to the inverter circuit 41 without passing through the interrupting MOSFETs 43 and 44.
- the pre-driver circuit 50 includes the main drive circuits 30 for the respective interrupting MOSFETs 43 and 44.
- Each main drive circuit 30 is formed by connecting a voltage divider circuit 31 and a drive MOSFET 32 in series in this order in the direction from the source of the interrupting MOSFET toward the negative electrode of the battery 92, and connecting the output of the voltage divider circuits 31 to the gate of the interrupting MOSFET.
- each voltage divider circuit 31 is formed by connecting a first voltage divider resistance R1 and a second voltage divider resistance R2 in series between the source of the interrupting MOSFET and the negative electrode of the battery 92, and the gate of the interrupting MOSFET is connected to the portion shared by the first voltage divider resistance R1 and the second voltage divider resistance R2.
- the drive MOSFETs 32 are, for example, N-channel MOSFETs.
- the drain is arranged on the voltage divider circuit 31-side, and the source is arranged on the negative electrode side of the battery 92.
- Each drive MOSFET 32 includes a parasitic diode 32D.
- the cathode of the parasitic diode 32D is arranged on the voltage divider circuit 31-side, and the anode of the parasitic diode 32D is arranged on the negative electrode-side of the battery 92.
- the pre-driver circuit 50 includes a start circuit 55 that connects the second voltage output portion 51A of the booster circuit 51 to the voltage divider circuits 31 via respective start MOSFETs 52.
- the start MOSFETs 52 are, for example, N-channel MOSFETs.
- the drain is arranged on the booster circuit 51-side, and the source is provided on the voltage divider circuit 31-side.
- the cathode is arranged on the booster circuit 51-side, and the anode is arranged on the voltage divider circuit 31-side.
- the gates of the start MOSFETs 52 and the drive MOSFETs 32 are connected to the control circuit 48, and turned on by the gate signals from the control circuit 48.
- the difference voltage (V2 - V1) which corresponds to the difference between the first voltage V1 and the second voltage V2 is applied between the both terminals of each of the voltage divider circuits 31, that is, between the source and the gate of each of the interrupting MOSFETs 43 and 44.
- the interrupting MOSFETs 43 and 44 are turned on.
- the motor drive circuit 40 includes a reverse connection protection circuit 70.
- the reverse connection protection circuit 70 is formed of, for example, an NPN transistor 71 and a compensation drive circuit 72.
- the transistor 71 is connected in parallel to the first voltage divider resistance R1 that forms the voltage divider circuit 31 between the source and the gate of the second interrupting MOSFET 44. More specifically, a collector is connected to one end of the first voltage divider resistance R1 that forms the voltage divider circuit 31, and an emitter is connected to the other end of the first voltage divider resistance R1.
- the compensation drive circuit 72 is connected to the transistor 71 and the negative electrode of the battery 92.
- the compensation drive circuit 72 is formed by connecting a first resistance R3 to the transistor 71 at a position between a base and the emitter, connecting a second resistance R4 and a diode 75 in series in this order in the direction from the base toward the negative electrode of the battery 92, and arranging the cathode of the diode 75 on the second resistance R4-side.
- the ignition switch 94 When the ignition switch 94 is turned on, electric power is supplied to the booster circuit 51, and the voltage output from the battery 92 is boosted from the first voltage V1 to the second voltage V2.
- the start MOSFETs 52 and the drive MOSFETs 32 are turned on by the gate signals from the control circuit 48, the difference voltage, which corresponds to the difference between the first voltage V1 and the second voltage V2, is applied between the both ends of each of the voltage divider circuits 31, that is, between the source and the gate of each of the interrupting MOSFETs 43 and 44, and the interrupting MOSFETs 43 and 44 are turned on.
- the control circuit 48 turns off the start MOSFETs 52 after the interrupting MOSFETs 43 and 44 are turned on. At the same time, the control circuit 48 continuously transmits the gate signals to the drive MOSFETs 32 to keep the drive MOSFETs 32 on. Even after the start MOSFETs 52 are trued off, the gate signals are transmitted to the interrupting MOSFETs 43 and 44 via the main drive circuits 30. Therefore, the interrupting MOSFETs 43 and 44 are kept on.
- the base voltage of the transistor 71 does not exceed the emitter voltage. Therefore, the base current does not flow from the base to the emitter, and the transistor 71 is kept off. That is, the situation where the source and the gate of the second interrupting MOSFET 44 are short-circuited by the transistor 71 and the second interrupting MOSFET 44 is turned off does not occur.
- provision of the diode 75 in the compensation drive circuit 72 makes it possible to reliably prevent current leak through the compensation drive circuit 72.
- the control circuit 48 stops transmission of the gate signals to the drive MOSFETs 32 to turn off the drive MOSFETs 32. Then, transmission of the gate signals to the interrupting MOSFETs 43 and 44 is stopped and the interrupting MOSFETs 43 and 44 are turned off. In this case, a current path that includes the parasitic diode 43D of the interrupting MOSFET 43 and the parasitic diode 44D of the interrupting MOSFET 44 is not formed. Therefore, conduction between the battery 92 and the inverter circuit 41 is interrupted.
- the steering wheel 17 If the steering wheel 17 is operated in this state, the situation where the motor 19 serves as a power generator and the battery 92 is charged with the electric power generated by the motor 19 does not occur. Therefore, the power generation resistance of the motor 19 is excluded from the steering resistance of the steering wheel 17. That is, it is possible to avoid the situation where a significantly large force is required to operate the steering wheel 17 due to the abnormal situation where the inverter circuit 41 cannot be used.
- the diode 75 If the diode 75 is turned on, the base voltage of the transistor 71 exceeds the emitter voltage. Therefore, the base current flows from the base to the emitter, and the transistor 71 is turned on. That is, because conduction between the collector and the emitter of the transistor 71 is permitted, the source and the gate of the second interrupting MOSFET 44 are short-circuited. Thus, the second interrupting MOSFET 44 is kept off.
- the parasitic diode 44D of the second interrupting MOSFET 44 the cathode is arranged on the inverter circuit 41-side. Therefore, if reverse connection of the battery 92 occurs, the parasitic diode 44D is also turned off. That is, because the second interrupting MOSFET 44 and the parasitic diode 44D are both turned off, a closed circuit that includes the battery 92 connected to the motor drive circuit 40 in reverse, the inverter circuit 41 and the first feed line L1 is not formed.
- a second embodiment of the invention will be described below.
- the second embodiment differs from the first embodiment in that a so-called “electromagnetic relay" is used as the reverse connection protection circuit 70 in the motor drive circuit 40.
- the other portions are the same as those in the first embodiment. Therefore, the same portions will be denoted by the same reference numerals and the description thereof will be omitted.
- the reverse connection protection circuit 70 is shown in FIG. 3 .
- the reverse connection protection circuit 70 includes a normally-open relay switch 77 that is connected in parallel to the first voltage divider resistance R1 in the voltage divider circuit 31, and a compensation drive circuit 79 that is formed by connecting an excitation coil 78 and the diode 75 in series in this order in the direction from the relay switch 77 toward the negative electrode of the battery 92 and arranging the cathode of the diode 75 on the excitation coil 78-side.
- the relay switch 77 is kept open (off).
- the relay switch 77 is closed (turned on), and the source and the gate of the second MOSFET 44 are short-circuited.
- the sources of the interrupting MOSFETs 43 and 44 are connected to each other.
- the drains of the interrupting MOSFETs 43 and 44 may be connected to each other.
- the reverse connection protection circuit 70 may be provided for the second interrupting MOSFET 44 that includes the parasitic diode 44D in which the anode is arranged on the positive electrode side of the battery 92 (cathode is arranged on the inverter circuit 41-side).
- N-channel MOSFETs are used as the interrupting MOSFETs 43 and 44.
- P-channel MOSFETs may be used as the interrupting MOSFETs 43 and 44.
- a light-emitting diode or a buzzer may be provided between the collector of the transistor 71 and one end of the first voltage divider resistance R1 or between the emitter of the transistor 71 and the other end of the first voltage divider resistance R1 in the reverse connection protection circuit 70. If reverse connection of the battery 92 occurs, a worker may be notified of the occurrence of reverse connection.
- the invention is applied to the so-called rack electric power steering apparatus 11 in which the cylindrical motor 19 and the inter-steered wheel shaft 13 are connected with each other by a ball screw mechanism.
- the invention may be applied to a pinion electric power steering apparatus in which a motor is connected to an inter-steered wheel shaft by a rack-and-pinion mechanism.
- the invention may be applied to a column electric power steering apparatus in which a motor is connected to a steering shaft with the use of a gear.
- a motor drive circuit includes a transistor that is connected in parallel to a first voltage divider resistance R1 that forms a voltage divider circuit between the source and the gate of a second interrupting MOSFET. If a reverse connection of the battery occurs, a compensation drive circuit turns on the transistor using an output from the battery so that the source and the gate of the second interrupting MOSFET are short-circuited. Thus, formation of a closed circuit that includes the battery and the inverter circuit is prevented. As a result, it is possible to prevent both terminals of the battery from being short-circuited.
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- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
- Control Of Ac Motors In General (AREA)
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- Control Of Direct Current Motors (AREA)
Description
- The invention relates to a motor drive circuit that includes an inverter circuit, and an electric power steering apparatus.
- In an electric power steering apparatus that includes a motor drive circuit, in an abnormal situation where an inverter circuit cannot be used, an alternating-current motor is rotated in accordance with a steering operation performed on a steering wheel. In this case, the alternating-current motor serves as an electric power generator, and, for example, a battery (direct-current power source) of a vehicle is charged with the electric power generated by the alternating-current motor. In this case, the steering resistance includes the resistance for generating electric power by concerting kinetic energy into electric energy (hereinafter, referred to as "power generation resistance").
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FIG 5 shows a motor drive circuit with which the power generation resistance is excluded from the steering resistance. In the motor drive circuit shown inFIG 5 , a pair of interrupting MOSFETs connected in series is arranged in a feed line that connects the positive electrode of a direct-current power source to an inverter circuit. These interrupting MOSFETs are connected to the feed line in such a manner that parasitic diodes thereof are in the opposite orientations. Therefore, the situation where an electric current flows through both the parasitic diodes is avoided. - The interrupting MOSFETs are turned on and off by respective drive circuit. Each drive circuit is formed by connecting a voltage divider circuit and a drive MOSFET in series in this order in the direction from the source of the interrupting MOSFET toward the negative electrode of the direct-current power source, and connecting the output of the voltage divider circuit to the gate of the interrupting MOSFET.
- In a normal situation, a control circuit continuously transmits gate signals to the drive MOSFETs to keep the interrupting MOSFETs on so that conduction between the direct-current power source and the inverter circuit is permitted. In contrast, in an abnormal situation where the inverter circuit cannot be used, transmission of gate signals to the drive MOSFETs is stopped so that the interrupting MOSFETs are turned off. Thus, conduction between the direct-current power source and the inverter circuit is interrupted so that the power generation resistance of the alternating-current motor is excluded from the steering resistance.
- For example, Japanese Patent Application Publication No.
11-146558 - However, in the existing motor drive circuit described above, if the positive electrode and the negative electrode of the direct-current power source are erroneously connected in reverse to the motor drive circuit, gate voltage is supplied to the interrupting MOSFETs through the drive circuits and the interrupting MOSFETs are turned on, whereby a closed circuit including the direct-current power source and the inverter circuit is formed. Then, a short-circuit current flows through the closed circuit as indicated by arrowed dot lines A, and the terminals of the direct-current power source are short-circuited.
- It is an object of the invention to provide a motor drive circuit that addresses the above-described problem, and an electric power steering apparatus that includes the motor drive circuit.
- An aspect of the invention relates to a motor drive circuit that includes: an inverter that is placed between and connected to a positive electrode and a negative electrode of a direct-current power source; a pair of nonuse-time interrupting MOSFETs connected in series and arranged in a feed line that connects the positive electrode of the direct-current power source and the inverter circuit in such a manner that paired parasitic diodes are in the opposite orientations; a pair of main drive circuits which are formed by connecting voltage divider circuits and drive MOSFETs in series in this order in a direction from sources of the nonuse-time interrupting MOSFETs toward the negative electrode of the direct-current power source, and connecting outputs of the voltage divider circuits to gates of the nonuse-time interrupting MOSFETs; a control circuit that transmits gate signals to the pair of drive MOSFETs to keep the pair of nonuse-time interrupting MOSFETs on in a normal situation, and that stops transmission of the gate signals to the pair of drive MOSFETs to turn off the pair of nonuse-time interrupting MOSFETs in an abnormal situation where the inverter circuit is not able to be used; a compensation switch element that is connected in parallel to a resistance that forms the voltage divider circuit between the source and the gate of the nonuse-time interrupting MOSFET that has the parasitic diode in which an anode is arranged on a positive electrode side of the direct-current power source; and a compensation drive circuit that is connected to the compensation switch element and the negative electrode of the direct-current power source. When the positive electrode and the negative electrode of the direct-current power source are connected to the motor drive circuit properly, the compensation drive circuit turns off the compensation switch element. In an abnormal situation where the positive electrode and the negative electrode of the direct-current power source are connected in reverse to the motor drive circuit, the compensation drive circuit turns on the compensation switch element using an output from the direct-current power source connected to the motor drive circuit in reverse.
- The compensation switch element is connected in parallel to the resistance that forms the voltage divider circuit between the source and the gate of the nonuse-time interrupting MOSFET in which the drain is arranged more proximal to the positive electrode of the direct-current power source than the source. If reverse connection of the direct-current power source occurs, the compensation drive circuit turns on the compensation switch using the output from the direct-current power source so that the source and the gate of the nonuse-time interrupting MOSFET are short-circuited. Thus, the nonuse-time interrupting MOSFET is kept off. In this case, a current path that includes the parasitic diodes is not formed.
- That is, with the motor drive circuit, if reverse connection of the direct-current power source occurs, a closed circuit that includes the direct-current power source and the inverter circuit is not formed. Therefore, it is possible to prevent the both terminals of the direct-current power source from being short-circuited.
- The motor drive circuit according to the above-described aspect may further include a booster circuit that boosts a first voltage that is a voltage of the positive electrode with respect to the negative electrode of the direct-current power source to a second voltage, and outputs the second voltage; and a start circuit that connects a second voltage output portion in the booster circuit that outputs the second voltage with the voltage divider circuits in the main drive circuits via start switches. The control circuit may turn on the start switches to apply a difference voltage, which corresponds to a difference between the first voltage and the second voltage, between both terminals of each of the voltage divider circuits in order to turn on the nonuse-time interrupting MOSFETs, and turns off the start switches after the nonuse-time interrupting MOSFETs are turned on.
- If the control circuit turns on the drive MOSFETs in the main drive circuits and turns on the start switches while the nonuse-time interrupting MOSFETs are off, the difference pressure, which corresponds to the difference between the first voltage and the second voltage, is applied between the both terminals of each off the voltage divider circuits (between the source and the gate of each of the nonuse-time interrupting MOSFETs), and the nonuse-time interrupting MOSFETs are turned on. After the nonuse-time interrupting MOSFETs are turned on, the start switches are turned off so that the second voltage is no longer output from the booster circuit. However, the gate signals are transmitted to the nonuse-time interrupting MOSFETs by the pair of main drive circuits that are arranged between the sources and the gates of the respective nonuse-time interrupting MOSFETs, and the negative electrode of the direct-current power source. Therefore, the nonuse-time interrupting MOSFETs are kept on until the drive MOSFETs are turned off.
- The foregoing and further features and advantages of the invention will become apparent from the following description of example embodiments with reference to the accompanying drawings, wherein like numerals are used to represent like elements and wherein:
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FIG 1 is a view schematically showing a vehicle in which an electric power steering apparatus according to a first embodiment of the invention is mounted; -
FIG.2 is a circuit diagram of a motor drive unit; -
FIG 3 is a circuit diagram of a motor drive unit according to a second embodiment of the invention; -
FIG. 4 is a circuit diagram of a motor drive unit according to a modification; and -
FIG. 5 is a circuit diagram of an existing motor drive circuit. - Hereafter, a first embodiment of the invention will be described with reference to
FIG. 1 andFIG 2 .FIG 1 shows avehicle 10 that includes an electricpower steering apparatus 11. The electricpower steering apparatus 11 includes aninter-steered wheel shaft 13 that extends in the lateral direction of thevehicle 10, and theinter-steered wheel shaft 13 passes through acylindrical housing 15 that is fixed to avehicle body 10H. The respective ends of theinter-steered wheel shaft 13 are connected to steeredwheels 12 via tie-rods 14. - The electric
power steering apparatus 11 includes an alternating-current motor 19 (more specifically, a three-phase alternating-current motor: hereinafter, referred to as "motor 19") that serves as a drive source. Astator 20 of themotor 19 is fixed in thecylindrical housing 15, and theinter-steered wheel shaft 13 passes through a hollow portion of arotor 21. Aball nut 22 that is fixed to the inner face of therotor 21 is screwed to aball screw portion 23 that is formed in the outer face of theinter-steered wheel shaft 13. Rotation of therotor 21 causes linear motion of theball screw portion 23. Themotor 19 is provided with arotational position sensor 25 that detects the rotational position θ2 of therotor 21. - As shown in
FIG 1 , arack 24 is formed in one end portion of theinter-steered wheel shaft 13, and apinion 18 formed at the lower end portion of asteering shaft 16 is meshed with therack 24. Asteering wheel 17 is fitted to the upper end portion of thesteering shaft 16, and atorque sensor 27 and asteering angle sensor 26 are fitted to a middle portion of thesteering shaft 16. Near the steeredwheel 12, there is provided avehicle speed sensor 28 that detects the vehicle speed V based on the rotational speed of the steeredwheel 12. - In the
vehicle 10, themotor 19 is driven by amotor drive circuit 40 shown inFIG. 2 . Aninverter circuit 41 in themotor drive circuit 40 is a three-phase bridge circuit that includes a U-phase circuit, a V-phase circuit, and a W-phase circuit (not shown) that are formed between the positive electrode and the negative electrode of abattery 92. Theinverter circuit 41 converts a direct-current output from thebattery 92 into a three-phase alternating current, and supplies the three-phase alternating current to themotor 19. - In a first feed line L1 that connects the positive electrode of the
battery 92 to theinverter circuit 41 in themotor drive circuit 40, aninterrupting circuit 42 that is formed by connecting a pair of interruptingMOSFETs MOSFETs parasitic diodes MOSFETs parasitic diodes parasitic diode 43D of the first interruptingMOSFET 43 is arranged on the positive electrode side of thebattery 92, and the cathode of theparasitic diode 44D of the second interruptingMOSFET 44 is arranged on the inverter circuit 41-side. Because theparasitic diodes parasitic diodes - A
fuse 45 is provided in the first feed line L1 at a position between the positive electrode of thebattery 92 and the first interruptingMOSFET 43. In addition,overvoltage protection circuits 46, each of which is formed by connecting the anodes of a pair ofzener diodes 46Z to each other, are provided between the gates and the sources of the respective interruptingMOSFET - The interrupting
MOSFETs pre-driver circuit 50 that is included in themotor drive circuit 40. Thepre-driver circuit 50 includes, for example, a charge-pump booster circuit 51. Thebooster circuit 51 is connected to a second feed line L2 that branches off from the first feed line L1 at a position between the positive electrode of thebattery 92 and thefuse 45. When anignition switch 94 provided in the second feed line L2 is turned on, conduction between thebooster circuit 51 and thebattery 92 is permitted. Then, a charge and discharge of a plurality of capacitors (not shown) provided in thebooster circuit 51 are repeated, whereby the first voltage V1 (e.g. 12V) that is the voltage of the positive electrode of thebattery 92 with respect to the negative electrode of thebattery 92 is boosted to the second voltage V2 (e.g. 32V), and the second voltage V2 is supplied from a secondvoltage output portion 51A to a pair ofmain drive circuits 30, described later in detail. - A
fuse 93 is provided in the second feed line L2 at a position between theignition switch 94 and the positive electrode of thebattery 92. Abackflow prevention diode 95 where the cathode is arranged on the booster circuit 51-side is connected to the second feed line L2 at a position between theignition switch 94 and thebooster circuit 51. Thebooster circuit 51 is not limited to a charge-pump booster circuit, and may be formed with the use of a booster coil. - A feed line L3 connects the second feed line L2 at a portion on the cathode side of the
diode 95 to the first feed line L1 at a portion on the drain side of the second interruptingMOSFET 44. The feed line L3 is provided to stably supply electric power to thepre-driver circuit 50 and acontrol circuit 48, for example, even if the electric power fluctuation occur in the second feed line L2 or electric power supply is interrupted due to contact failure of a connector. That is, thepre-driver circuit 51 and thecontrol circuit 48 may receive the electric power from thebattery 92 through two power lines. Abackflow prevention diode 97 where the cathode is arranged on the booster circuit 51-side is provided in the feed line L3. Therefore, an electric current does not flow from thebattery 92 to theinverter circuit 41 without passing through the interruptingMOSFETs - The
pre-driver circuit 50 includes themain drive circuits 30 for the respective interruptingMOSFETs main drive circuit 30 is formed by connecting avoltage divider circuit 31 and adrive MOSFET 32 in series in this order in the direction from the source of the interrupting MOSFET toward the negative electrode of thebattery 92, and connecting the output of thevoltage divider circuits 31 to the gate of the interrupting MOSFET. - More specifically, each
voltage divider circuit 31 is formed by connecting a first voltage divider resistance R1 and a second voltage divider resistance R2 in series between the source of the interrupting MOSFET and the negative electrode of thebattery 92, and the gate of the interrupting MOSFET is connected to the portion shared by the first voltage divider resistance R1 and the second voltage divider resistance R2. - The
drive MOSFETs 32 are, for example, N-channel MOSFETs. In eachdrive MOSFET 32, the drain is arranged on the voltage divider circuit 31-side, and the source is arranged on the negative electrode side of thebattery 92. Eachdrive MOSFET 32 includes aparasitic diode 32D. The cathode of theparasitic diode 32D is arranged on the voltage divider circuit 31-side, and the anode of theparasitic diode 32D is arranged on the negative electrode-side of thebattery 92. - The
pre-driver circuit 50 includes astart circuit 55 that connects the secondvoltage output portion 51A of thebooster circuit 51 to thevoltage divider circuits 31 viarespective start MOSFETs 52. Thestart MOSFETs 52 are, for example, N-channel MOSFETs. In thestart MOSFET 52, the drain is arranged on the booster circuit 51-side, and the source is provided on the voltage divider circuit 31-side. In aparasitic diode 52D of thestart MOSFET 52, the cathode is arranged on the booster circuit 51-side, and the anode is arranged on the voltage divider circuit 31-side. - When the
drive MOSFETs 32 and thestart MOSFETs 52 are both off, gate signals are not transmitted to the interruptingMOSFETs MOSFETs - The gates of the
start MOSFETs 52 and thedrive MOSFETs 32 are connected to thecontrol circuit 48, and turned on by the gate signals from thecontrol circuit 48. When thestart MOSFETs 52 are turned on, the difference voltage (V2 - V1), which corresponds to the difference between the first voltage V1 and the second voltage V2, is applied between the both terminals of each of thevoltage divider circuits 31, that is, between the source and the gate of each of the interruptingMOSFETs MOSFETs - The
motor drive circuit 40 according to the first embodiment includes a reverseconnection protection circuit 70. The reverseconnection protection circuit 70 is formed of, for example, anNPN transistor 71 and acompensation drive circuit 72. Thetransistor 71 is connected in parallel to the first voltage divider resistance R1 that forms thevoltage divider circuit 31 between the source and the gate of the second interruptingMOSFET 44. More specifically, a collector is connected to one end of the first voltage divider resistance R1 that forms thevoltage divider circuit 31, and an emitter is connected to the other end of the first voltage divider resistance R1. - The
compensation drive circuit 72 is connected to thetransistor 71 and the negative electrode of thebattery 92. Thecompensation drive circuit 72 is formed by connecting a first resistance R3 to thetransistor 71 at a position between a base and the emitter, connecting a second resistance R4 and adiode 75 in series in this order in the direction from the base toward the negative electrode of thebattery 92, and arranging the cathode of thediode 75 on the second resistance R4-side. - The structure according to the first embodiment has been described above. The effects of the first embodiment will be described below. First, the case where the positive and negative electrodes of the
battery 92 are properly connected to themotor drive circuit 40 will be described. - When the
ignition switch 94 is turned on, electric power is supplied to thebooster circuit 51, and the voltage output from thebattery 92 is boosted from the first voltage V1 to the second voltage V2. When thestart MOSFETs 52 and thedrive MOSFETs 32 are turned on by the gate signals from thecontrol circuit 48, the difference voltage, which corresponds to the difference between the first voltage V1 and the second voltage V2, is applied between the both ends of each of thevoltage divider circuits 31, that is, between the source and the gate of each of the interruptingMOSFETs MOSFETs battery 92 and theinverter circuit 41 is permitted, and theinverter circuit 41 converts the direct-current output from thebattery 92 into the three-phase alternating-current, and supplies the three-phase alternating current to themotor 19. Thus, a steering operation performed on thesteering wheel 17 by the driver is assisted by the assist torque generated by themotor 19. - The
control circuit 48 turns off thestart MOSFETs 52 after the interruptingMOSFETs control circuit 48 continuously transmits the gate signals to thedrive MOSFETs 32 to keep thedrive MOSFETs 32 on. Even after thestart MOSFETs 52 are trued off, the gate signals are transmitted to the interruptingMOSFETs main drive circuits 30. Therefore, the interruptingMOSFETs - When the
battery 92 is properly connected to themotor drive circuit 40, the base voltage of thetransistor 71 does not exceed the emitter voltage. Therefore, the base current does not flow from the base to the emitter, and thetransistor 71 is kept off. That is, the situation where the source and the gate of the second interruptingMOSFET 44 are short-circuited by thetransistor 71 and the second interruptingMOSFET 44 is turned off does not occur. In addition, provision of thediode 75 in thecompensation drive circuit 72 makes it possible to reliably prevent current leak through thecompensation drive circuit 72. - If an abnormal situation where the
inverter circuit 41 cannot be used occurs during power supply to themotor 19, thecontrol circuit 48 stops transmission of the gate signals to thedrive MOSFETs 32 to turn off thedrive MOSFETs 32. Then, transmission of the gate signals to the interruptingMOSFETs MOSFETs parasitic diode 43D of the interruptingMOSFET 43 and theparasitic diode 44D of the interruptingMOSFET 44 is not formed. Therefore, conduction between thebattery 92 and theinverter circuit 41 is interrupted. - If the
steering wheel 17 is operated in this state, the situation where themotor 19 serves as a power generator and thebattery 92 is charged with the electric power generated by themotor 19 does not occur. Therefore, the power generation resistance of themotor 19 is excluded from the steering resistance of thesteering wheel 17. That is, it is possible to avoid the situation where a significantly large force is required to operate thesteering wheel 17 due to the abnormal situation where theinverter circuit 41 cannot be used. - Next, the effects of the first embodiment that are obtained when the positive electrode and the negative electrode of the
battery 92 are connected in reverse to themotor drive circuit 40 will be described. If reverse connection of thebattery 92 occurs, theparasitic diodes 32D of thedrive MOSFETs 32 are turned on and themain drive circuits 30 are placed in the conduction state. Further, thediode 75 included in thecompensation drive circuit 72 is turned on. - If the
diode 75 is turned on, the base voltage of thetransistor 71 exceeds the emitter voltage. Therefore, the base current flows from the base to the emitter, and thetransistor 71 is turned on. That is, because conduction between the collector and the emitter of thetransistor 71 is permitted, the source and the gate of the second interruptingMOSFET 44 are short-circuited. Thus, the second interruptingMOSFET 44 is kept off. In theparasitic diode 44D of the second interruptingMOSFET 44, the cathode is arranged on the inverter circuit 41-side. Therefore, if reverse connection of thebattery 92 occurs, theparasitic diode 44D is also turned off. That is, because the second interruptingMOSFET 44 and theparasitic diode 44D are both turned off, a closed circuit that includes thebattery 92 connected to themotor drive circuit 40 in reverse, theinverter circuit 41 and the first feed line L1 is not formed. - Because the
backflow prevention diode 95 is provided in the second feed line L2, a closed circuit that includes thebattery 92 connected to themotor drive circuit 40 in reverse, theinverter circuit 41, the feed line L3 and the second feed line L2 is not formed. - With the
motor drive circuit 40 according to the first embodiment, even if reverse connection of thebattery 92 occurs, it is possible to avoid the situation where the both terminals of the battery 2 are short-circuited due to formation of the closed circuit including thebattery 92 and theinverter circuit 41. Thus, it is possible to avoid the situation where the interruptingMOSFETs power steering apparatus 11 according to the first embodiment, it is possible to prevent a failure that may occur when reverse connection of thebattery 92 occurs because the above-describedmotor drive circuit 40 is provided. - When reverse connection of the
battery 92 occurs, a potential difference is caused between the source and the gate of the first interruptingMOSFET 43. Therefore, the first interruptingMOSFET 43 is turned on. Then, a closed circuit including themain drive circuits 30, thetransistor 71 and the first interruptingMOSFET 43 is formed. However, it is possible to avoid the situation where the first interruptingMOSFET 43 is broken by an over current, because the voltage divider resistances R1 and R2 are included in the closed circuit. - A second embodiment of the invention will be described below. The second embodiment differs from the first embodiment in that a so-called "electromagnetic relay" is used as the reverse
connection protection circuit 70 in themotor drive circuit 40. The other portions are the same as those in the first embodiment. Therefore, the same portions will be denoted by the same reference numerals and the description thereof will be omitted. - The reverse
connection protection circuit 70 is shown inFIG. 3 . The reverseconnection protection circuit 70 includes a normally-open relay switch 77 that is connected in parallel to the first voltage divider resistance R1 in thevoltage divider circuit 31, and acompensation drive circuit 79 that is formed by connecting anexcitation coil 78 and thediode 75 in series in this order in the direction from the relay switch 77 toward the negative electrode of thebattery 92 and arranging the cathode of thediode 75 on the excitation coil 78-side. - If the
battery 92 is connected to themotor drive circuit 40 properly, thediode 75 is turned off and an electric current is not supplied to theexcitation coil 78, Therefore, the relay switch 77 is kept open (off). On the other hand, if thebattery 92 is connected in reverse to themotor drive circuit 40, an electric current is supplied to theexcitation coil 78 and theexcitation coil 78 is excited because thediode 75 is turned on. Thus, the relay switch 77 is closed (turned on), and the source and the gate of thesecond MOSFET 44 are short-circuited. - The invention is not limited to the above-described embodiments. For example, embodiments described below are within the technical scope of the invention. In addition, various other modifications may be made to the invention within the scope of the invention.
- 1) In the first and second embodiments described above, the sources of the interrupting
MOSFETs FIG. 4 , the drains of the interruptingMOSFETs connection protection circuit 70 may be provided for the second interruptingMOSFET 44 that includes theparasitic diode 44D in which the anode is arranged on the positive electrode side of the battery 92 (cathode is arranged on the inverter circuit 41-side). - 2) In the first and second embodiments described above, N-channel MOSFETs are used as the interrupting
MOSFETs MOSFETs - 3) In the first embodiment, a light-emitting diode or a buzzer may be provided between the collector of the
transistor 71 and one end of the first voltage divider resistance R1 or between the emitter of thetransistor 71 and the other end of the first voltage divider resistance R1 in the reverseconnection protection circuit 70. If reverse connection of thebattery 92 occurs, a worker may be notified of the occurrence of reverse connection. - 4) In the first and second embodiments described above, the invention is applied to the so-called rack electric
power steering apparatus 11 in which thecylindrical motor 19 and theinter-steered wheel shaft 13 are connected with each other by a ball screw mechanism. Alternatively, the invention may be applied to a pinion electric power steering apparatus in which a motor is connected to an inter-steered wheel shaft by a rack-and-pinion mechanism. Further alternatively, the invention may be applied to a column electric power steering apparatus in which a motor is connected to a steering shaft with the use of a gear. - A motor drive circuit includes a transistor that is connected in parallel to a first voltage divider resistance R1 that forms a voltage divider circuit between the source and the gate of a second interrupting MOSFET. If a reverse connection of the battery occurs, a compensation drive circuit turns on the transistor using an output from the battery so that the source and the gate of the second interrupting MOSFET are short-circuited. Thus, formation of a closed circuit that includes the battery and the inverter circuit is prevented. As a result, it is possible to prevent both terminals of the battery from being short-circuited.
Claims (4)
- A motor drive circuit (40), comprising:an inverter circuit (41) that is placed between and connected to a positive electrode and a negative electrode of a direct-current power source (92);a pair of nonuse-time interrupting MOSFETs (43, 44) connected in series and arranged in a feed line (L1) that connects the positive electrode of the direct-current power source (92) and the inverter circuit (41) in such a manner that paired parasitic diodes (43D, 44D) are in opposite orientations;a pair of main drive circuits (30) which are formed by connecting voltage divider circuits (31) and drive MOSFETs (32) in series in this order in a direction from sources of the nonuse-time interrupting MOSFETs (43, 44) toward the negative electrode of the direct-current power source (92), and connecting outputs of the voltage divider circuits (31) to gates of the nonuse-time interrupting MOSFETs (43, 44); anda control circuit (48) that is configured to transmit gate signals to the pair of drive MOSFETs (32) to keep the pair of nonuse-time interrupting MOSFETs (43, 44) on in a normal situation, and that is configured to stop transmission of the gate signals to the pair of drive MOSFETs (32) to turn off the pair of nonuse-time interrupting MOSFETs (43, 44) in an abnormal situation where the inverter circuit (41) is not able to be used;characterized by further comprisinga compensation switch element (71) that is connected in parallel to a resistance (R1) that forms the voltage divider circuit (31) between the source and the gate of the nonuse-time interrupting MOSFET (44) that has the parasitic diode (44D) in which an anode is arranged on a positive electrode side of the direct-current power source (92); anda compensation drive circuit (72) that is connected to the compensation switch element (71) and the negative electrode of the direct-current power source (92), wherein when the positive electrode and the negative electrode of the direct-current power source (92) are connected to the motor drive circuit (40) properly, the compensation drive circuit (72) is configured to turn off the compensation switch element (71), and in an abnormal situation where the positive electrode and the negative electrode of the direct-current power source (92) are connected in reverse to the motor drive circuit (40), the compensation drive circuit (72) is configured to turn on the compensation switch element (71) using an output from the direct-current power source (92) connected to the motor drive circuit (40) in reverse.
- The motor drive circuit (40) according to claim 1, characterized in that:the compensation switch element (71) is an NPN transistor; anda first resistance (R3) is connected to the transistor (71) at a position between a base and an emitter and a second resistance (R4) is arranged between and connected to the base and the negative electrode of the direct-current power source (92) to form the compensation drive circuit (72).
- The motor drive circuit (40) according to claim 1 or 2, characterized by further comprising:a booster circuit (51) that is configured to boost a first voltage (V1) that is a voltage of the positive electrode with respect to the negative electrode of the direct-current power source (92) to a second voltage (V2), and to output the second voltage (V2); anda start circuit (55) that connects a second voltage output portion (5aA) in the booster circuit (51) that outputs the second voltage (V2) with the voltage divider circuits (31) in the main drive circuits (30) via start switches (52), whereinthe control circuit (48) is configured to turn on the start switches (52) to apply a difference voltage, which corresponds to a difference between the first voltage (V1) and the second voltage (V2), between both terminals of each of the voltage divider circuits (31) in order to turn on the nonuse-time interrupting MOSFETs (43, 44), and to turn off the start switches (52) after the nonuse-time interrupting MOSFETs (43, 44) are turned on.
- An electric power steering apparatus (11), comprising:the motor drive circuit (40) according to any one of claims 1 to 3, whereinan alternating-current motor (19) is used as a drive source.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008283278A JP5246407B2 (en) | 2008-11-04 | 2008-11-04 | Motor drive circuit and electric power steering device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2182629A2 EP2182629A2 (en) | 2010-05-05 |
EP2182629A3 EP2182629A3 (en) | 2011-03-02 |
EP2182629B1 true EP2182629B1 (en) | 2017-05-03 |
Family
ID=42041853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP09174847.5A Not-in-force EP2182629B1 (en) | 2008-11-04 | 2009-11-03 | Motor drive circuit and electric power steering apparatus |
Country Status (4)
Country | Link |
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US (1) | US8159166B2 (en) |
EP (1) | EP2182629B1 (en) |
JP (1) | JP5246407B2 (en) |
CN (1) | CN101741311B (en) |
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JP5152526B2 (en) * | 2009-04-24 | 2013-02-27 | 株式会社デンソー | In-vehicle power converter |
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JP5012879B2 (en) * | 2009-11-16 | 2012-08-29 | 株式会社ジェイテクト | Motor control device, electric power steering device, and vehicle steering device |
US8350510B2 (en) * | 2009-11-27 | 2013-01-08 | Denso Corporation | Voltage booster apparatus for power steering system |
DE102010035149B4 (en) * | 2010-08-23 | 2019-03-21 | Thyssenkrupp Presta Aktiengesellschaft | Safety circuit for an electric motor of an electromechanical steering |
JP5311233B2 (en) * | 2010-12-27 | 2013-10-09 | 株式会社デンソー | Motor control device and electric power steering device using the same |
JP5742356B2 (en) * | 2011-02-23 | 2015-07-01 | 株式会社ジェイテクト | Control device for electric power steering device |
JP5638488B2 (en) * | 2011-09-07 | 2014-12-10 | 株式会社東芝 | Switch drive circuit, inverter device and power steering device |
JP5743934B2 (en) | 2012-03-16 | 2015-07-01 | 株式会社東芝 | Inverter device and power steering device |
JP5961854B2 (en) * | 2012-07-23 | 2016-08-02 | 株式会社明電舎 | Motor drive circuit |
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JP2016127695A (en) * | 2014-12-26 | 2016-07-11 | トヨタ自動車株式会社 | Motor drive device and power steering device |
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-
2008
- 2008-11-04 JP JP2008283278A patent/JP5246407B2/en not_active Expired - Fee Related
-
2009
- 2009-10-29 US US12/588,843 patent/US8159166B2/en not_active Expired - Fee Related
- 2009-11-03 EP EP09174847.5A patent/EP2182629B1/en not_active Not-in-force
- 2009-11-04 CN CN200910209352.7A patent/CN101741311B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JP5246407B2 (en) | 2013-07-24 |
CN101741311B (en) | 2014-06-04 |
CN101741311A (en) | 2010-06-16 |
EP2182629A3 (en) | 2011-03-02 |
JP2010114957A (en) | 2010-05-20 |
EP2182629A2 (en) | 2010-05-05 |
US20100109588A1 (en) | 2010-05-06 |
US8159166B2 (en) | 2012-04-17 |
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